31=3(u-3)-8u

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Solution for 31=3(u-3)-8u equation: 



31=3(u-3)-8u

We move all terms to the left:

31-(3(u-3)-8u)=0



We calculate terms in parentheses: -(3(u-3)-8u), so:

3(u-3)-8u

We add all the numbers together, and all the variables

-8u+3(u-3)

We multiply parentheses

-8u+3u-9

We add all the numbers together, and all the variables

-5u-9

Back to the equation:

-(-5u-9)



We get rid of parentheses

5u+9+31=0

We add all the numbers together, and all the variables

5u+40=0

We move all terms containing u to the left, all other terms to the right

5u=-40

u=-40/5

u=-8

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